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| Fall (23:1) |
 Contributions to Geology Table of Contents |
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| 1990s | 1990 | 1991 | 1992 | – | 1994 | – | 1996 | 1997 | 1998 | – |
| 1980s | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 |
| 1970s | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 |
| 1960s | – | – | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969 |